Heavy-Duty Trailer Ramp Springs and Door Assist Springs | Custom Manufacturing Experts

Trailer ramp springs—also known as ramp assist or trailer door springs—are critical components for safe, efficient trailer operation. Whether used on enclosed cargo trailers, car haulers, landscape trailers, or heavy-duty utility units, these torsion springs counterbalance the weight of trailer doors and ramps, making them easier to lift and lowering the risk of strain or damage. At Ace Wire Spring & Form Co., Inc., we manufacture custom trailer ramp and door assist springs engineered for performance, longevity, and operator safety.

What Are Trailer Ramp Springs?

Trailer ramp springs are heavy-duty torsion springs that provide lift assistance when opening and closing trailer doors or ramps. Installed along a shaft or hinge system, these springs store energy as the door closes and release it as the door opens. Properly calibrated spring torque reduces manual lifting force, minimizes wear on door hinges, and improves safety during operation.

Types of Trailer Ramp Springs

Torsion Ramp Springs: Used for rear or side trailer doors where rotational counterforce is required. Each spring can be customized for torque, coil diameter, and leg configuration. Extension Ramp Springs: Ideal for linear motion applications such as fold-down or telescoping ramps. Double Torsion Spring Assemblies: Designed for large, heavy doors that demand equalized torque and smooth travel. Wire Forms and Custom Linkages: Used in latches, lift mechanisms, and hinge systems where precise geometry is needed.

Materials and Manufacturing Quality

Trailer ramp springs must withstand repeated load cycles, vibration, and exposure to weather. Ace Wire Spring manufactures these parts from high-grade materials such as chrome-silicon, chrome-vanadium, high-carbon steel, and stainless steel. Each spring is precision-formed on CNC coiling equipment, heat-treated for strength, and shot-peened to enhance fatigue life. Optional coatings such as zinc plating, phosphate, black oxide, or powder coating protect against corrosion. For marine or salt-road applications, stainless steel or galvanized finishes are available.

Design Assistance and Engineering Collaboration

Every trailer ramp design is unique, and spring performance depends on door weight, hinge placement, and user requirements. While Ace Wire Spring does not design springs from scratch, our experienced team provides design assistance to ensure manufacturability, proper torque balance, and optimal material selection. We work directly with OEM engineers, trailer fabricators, and aftermarket specialists to meet precise load and fit specifications.

Advantages of Custom-Manufactured Trailer Ramp Springs

Custom-built trailer ramp and door springs outperform stock or imported alternatives. Advantages include:
• Exact torque and fit for each door assembly.
• Consistent, smooth door operation.
• Improved safety and reduced manual lifting effort.
• Long life cycle through precision heat treatment and shot-peening.
• Corrosion-resistant finishes for extended outdoor use.
• Domestic manufacturing for superior quality and faster lead times.

Applications Across the Trailer and Transportation Industry

• Cargo and Enclosed Trailers: Rear and side ramp doors for easier loading and unloading.
• Utility and Landscape Trailers: Lift-assist gates and storage door systems.
• Car Haulers and Race Trailers: Fold-down or two-piece loading ramps.
• Agricultural and Equipment Trailers: Heavy-duty gate assists and rear enclosures.
• Service Trucks and Mobile Equipment Units: Compartment and tool access doors requiring spring assist.

Surface Finishing and Corrosion Protection Options

To ensure performance in demanding outdoor environments, Ace offers several finish options—zinc, phosphate, black oxide, powder coat, or stainless steel passivation. These coatings resist rust, reduce wear, and enhance appearance. Custom color-matched coatings are available upon request for OEM programs.

Quality, Certification, and Made in USA Manufacturing

Ace Wire Spring & Form Co., Inc. is ISO 9001:2015 certified and ITAR registered. Every trailer ramp spring is produced in our Pittsburgh, Pennsylvania facility using locally sourced materials and advanced CNC equipment. With over 85 years of experience, we uphold the highest standards of consistency, traceability, and repeatability across every production run.

Why Trailer Ramp Spring Quality Matters

A properly manufactured ramp spring doesn’t just improve convenience—it enhances safety. Low-quality or improperly balanced springs can cause doors to slam, wear prematurely, or fail unexpectedly. Ace’s precision coiling, stress-relief, and testing processes ensure reliable door control, smooth travel, and maximum life expectancy. For OEMs, distributors, and fleet operators, this reliability means fewer maintenance issues and reduced downtime.

Call to Action

If you manufacture or maintain trailers that require safe, long-lasting ramp or door assist springs, contact Ace Wire Spring & Form Co., Inc. Our experts can assist with material selection, torque specifications, and production scheduling to deliver precision-engineered solutions. Request a quote today to see why OEMs and distributors nationwide trust Ace Wire Spring for performance, consistency, and Made-in-USA quality.

RJ Froehlich

Ace Wire Spring & Form Co., Inc. is dedicated to educating the world about the critical role springs play in everyday life and industrial innovation. From small mechanisms to large-scale machinery, springs are everywhere—and our mission is to grow our business by helping others understand their importance and potential.

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